The BOSS-CR accessory offers all the accuracy and tunable advantages of the original BOSS device without the muzzle brake feature. By simply replacing the original BOSS forward weight and recoil reduction components with the one-piece, no hole BOSS-CR accessory, only the reduced recoil of the original BOSS is sacrificed, The BOSS-CR accessory is designed to fit only Bar MK II's and A-bolt centerfire rifles previously factory fitted with BOSS.